HD74LS190 Datasheet, PDF(9/11 Page) Hitachi Semiconductor – Synchronous Up/Down Decade Counters(single clock line)

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HD74LS190 Datasheet, PDF (9/11 Pages) Hitachi Semiconductor – Synchronous Up/Down Decade Counters(single clock line)

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HD74LS190

Waveforms 4

ClockâQ

Load

Data

Down/Up

Clock

1.3V

Notes:

Enable = 0V

1.3V

tPLH

1.3V

tPHL

VOH

VOL

1. When test the QA, QB, and QC outputs, data inputs A, B and C are shown by the solid line, and

data input D is shown by the dashed line.

2. When test the QD output, data inputs A and D are shown by the solid line, and data inputs B

and C are held at the low logic level.

Waveforms 5

ClockâMax / Min

Load

Inputs

B, C, D

Down/Up

Clock

1.3V

Note:

Max/Min

Enable = 0V

1.3V

tPLH

tPHL

tPLH

tPHL

VOH

VOL

Data inputs B and C are shown by the dashed line. Data input D is shown by the solid line.

Rev.3.00, Jul.15.2005, page 9 of 10

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